Variable high resistance



March 31, 1925. 1,531,390

G.GREEN VARIABLE HIGH RESISTANCE Fild April 2. 1923 Fig.2.

)v VENTOR Patented Mar. 31, 1925.

UNITED STATES,

PATENT OFFICE.

VARIABLE HIGH RESISTANCE.

Application filed April 2, 1923. Serial No. $29,294,

To all whom it may concern:

Be it known that I, GOULD GREEN, a citizen of the United States, andresident of New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Variable HighResistances, of which the following is a specification.

My invention relates to improvements in variable high resistances foruse in electrical and wireless apparatus. The object of my invention isto provide an inexpensive high resistance element which ismechanicallyand electrically correct. 3

The accompanying drawing "illustrates one form of my invention, in whichFig. ,1 is a top view. Fig 2 is a cross-section along the line 22'.

Fig. 3 is a top view with plate a removed.

Fig. 4 is a top and side view of the slider.

Fig. 5 is a modification of my invention.

Similar letters refer, 'to similar parts throughout the several views.

Fig. 1 is a top view, showing the top plate, which is made of someinsulating material such as fibre, etc., with the slot, 0, in which thepart, 0?, of the slider, 6, moves. Also, a graduated scale, 9, is placedon this op piece, a. The eyelets, 72., hold the top plate, a, and thebottom plate, I), together and act as the terminals of the device. 7

In Fig. 2, the slider, e, is shown secured to the bottom, 6, by means ofan eyelet j; and shows the manner of assembly. The high resistanceelement, Z0, may be a pencil mark on the bottom, 6, or any other highresistance material. This high resistance element is protected by thetop, a.

Fig. 4, shows the slider, e, which has a depression, m, which makescontact with the high resistance element, k, as is shown in Fi (3.. Theslider, e, istele'etrically connecte to. one eyelet'as shown at, p, in,Fig. 1.

Fig. 5, is a; simplified modification of my 'inventionin which the topplate, (2, 1s leftoff, and the graduated scale is placed on the bottomplate, .6, as-is shown. In this modification the high resistance, is,would be exposed to the moisture and dust of the atmosphere, which isundesirable The slider,

e, can be made of what is known in the trade as a tongue eyelet, whichconsists of the slider and the eyelet made in one piece. This tongueeyelet can be set into another eyelet so that it revolves freely. thusmaking an all metal bearing.

In operation, this resistance is placed in the electric circuit, usingthe two eyelets as terminals, and the slider may be moved as desired.The scale is not necessarily accurately calibrated to indicateresistance values, but is generally provided merely as a convenientmeans for recording various settings of the device.

claim as new:

1. In a variable resistance device, a plate of insulating material, aresistance element on said plate, a slider arranged to wipe over saidresistance element, said slider having an integral eyelet portion bywhich it is pivotally secured to said base; a second plate of insulatingmaterial having an opening through which the free end portion of saidslider extends, said second plate forming a protective cover. for saidresistance element, said plates being secured together.

2. In a variable resistance device, a plate of insulating material, aresistance element secured to said plate, a slider having an integraleyelet portion by which it is pivotally secured to said plate, the freeend of said slider being adapted to wipe over said resistance element; asecond plate of insulating material superimposed on said first plate,said second plate forming a protective cover for said resistance elementand having an arcuate slot through which the free end portion of saidslider projects, means for securing said plates together and means forpivotally securing said slider to said first plate; both of said meansbeing adapted to function as terminals for said device.

Signed at New York, in the count of New York and State of New York, this31 day of March, A. D. 1923.

GOULD GREEN.

